An investigation is underway after one of Ana Kriegel's killers was allegedly assaulted in Oberstown Detention Centre in Dublin over the weekend.
It has been almost a year since BOY A was found guilty of murdering Ana Kriegel at a derelict farmhouse in Lucan in May 2018.
The then 13 year-old beat the teenager to death after his co-accused, BOY B, lured her from her home in Leixlip, Co. Kildare.
BOY B was also found guilty of her murder, but is in the process of appealing his conviction.
The boys, who can never be identified because of their ages at the time, are serving their sentences at Oberstown Detention Centre in north Dublin.
Gardaí have confirmed they are investigating an alleged assault on BOY A.
They are looking into claims he was beaten up by other young offenders in a communal area at the facility in Lusk on Sunday evening.
